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1947-48 Theatre Catalog, 6th Edition, Page 288 (274)

1947-48 Theatre Catalog, 6th Edition
1947-48 Theatre Catalog
1947-48 Theatre Catalog, 6th Edition, Page 288
Page 288


1947-48 Theatre Catalog, 6th Edition, Page 288

III'%% / III-I . A III-

DIMMING CURVE [.5 K.W. UNIT

DIAL CALIBRATION VS. R. M.S. VOLTS

R. MS. VOLTS

.2 K.W. LOAD .5 K.W. LOAD I.5 K.W. LOAD

l 2 3 4 5 6 7 8 9 IO DIAL CALIBRATION

FIGURE 8-Dimming curve of the 1.5-kw. unit. The dimming curve closely approached linearity with with ratio ot change between 1 and 8 and between 8 and 10 than in the middle area, showing that, with proper compensation, absolute linearity can be achieved. The graph shows the relation between the dial calibration and r.n1.s. volts, for loads of 0.2, 0.5, and 1.5 kw. The linear curve is given

FIGURE SeDimming curve of the l.5-kw. unit, showing the light output in toot candles plotted against the dial calibration. The light output curve at a 1.5-kw. lamp is similar to the 1.5-kw. voltage curve shown in Figure 8. The average anode eHiciency of the individual circuits is 90 percent and the overall etticiency 87 percent. The console operates on 80 watts, exclusive of the pilot lights.







DIMMING CURVE L5 K.W. UNIT



DIAL CALIBRATION VS.

LIGHT OUT PUT

FOOT CANDLES

I.5K.W. LOAD -' - - LINEAR



I 2 3 4 5 6 7 8 9 I0 DIAL CALIBRATION

with a slower ratio of change between 1 and 3 and between 8 and 10 than in the middle area, showing that, with proper compensation, absolute linearity could be achieved. Figure 9 shows the light output curve of a 1.5-kw. lamp to be similar in slope to the 1.5-kw. load voltage curve of Figure 8.

The average anode efficiency of the individual circuits is 90 percent and the over-all efficiency 87 percent. The entire console operates on 80 watts exclusive of pilot lights.

As a means of communication with the stage during rehearsals and performances, two communication systems are provided. A reversible amplifier channel controlled by a foot switch on the console is normally in the listen position from the stage, thereby allowing the operator to talk to the stage without the use of his hands. Should this system fail, a cradle telephone system is provided. The show is heard in the console room by a separate amplifying system. with dynamic microphones installed on the balcony rail and with the speaker output hung on the wall in front of the operator.

SUMMARY

This electronic console control system provides all the qualifications essential to a modern system of intensity control, namely:

(1) Flexibility, ease, and convenience of operation. The individual circuits are subject to a wide loading ratio, the dimming curve is essentially linear and pros portional mastering and fading are accomplished. The controls are all operated easily with little effort on the part of the operator and the nature of the tube grid circuits enable the logical grouping of the controls for convenience of operation as well as the situation of the control desk at a point of vantage in front of the stage where the operator can both see and hear.

(2) Adaptability to all types of theatre buildings and productions. Since this system is unitized, it can be made to fit either a university theatre or an opera house.

(3) An initial cost commensurate with the theatres ability to pay, and means provided for the progressive purchase and installation of the separate components of the system thereby allowing enlargement within a pre-determined master framework without addition to the original construction. This is the first system of intensity control to embody a single network control of both switching and dimming by means of a single element and fulfills a long-felt need for an ellicient system of plug-in units where amplifiers and controls are wired complete at the factory and can be plugged into master pre-wired racks and control console.

(4) A reasonably low cost of maintenance is ensured by unitizing.

(5) Efficiency of operation. This is assured due to the fact that efficiency is a primary quality of the thyratron tube.

This electronic console system can be quickly summarized as an ehicient single network system at lreasonable cost, unitized, and standardized so as to make progressive purchase possible and incorporating the above-mentioned operational advantages.

THEATRE CATALOG 1947-48
1947-48 Theatre Catalog, 6th Edition, Page 288